Using jquery 3 makes no difference. Tab key is still not working.
<html>
<head>
<link rel="stylesheet" href="jqwidgets/styles/jqx.base.css" >
<script type="text/javascript" src="scripts/jquery-3.0.0.min.js"></script>
<script type="text/javascript" src="jqwidgets/jqxcore.js"></script>
<script type="text/javascript" src="jqwidgets/jqxinput.js"></script>
<script type="text/javascript" src="jqwidgets/jqxwindow.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$("#test1, #test2").jqxInput({ width: 100, height: 20 });
$("#test3").jqxInput({ width: 100, height: 20 });
$("#Popup").jqxWindow({ height:90, width: 150, isModal: true, autoOpen: false });
});
</script>
</head>
<body>
<div id="Main">
<input type="text" tabindex="1" id="test1" />
<input type="text" tabindex="2" id="test2" />
</div>
<div id="Popup">
<div>Header</div>
<div>
<input type="text" tabindex="3" id="test3" />
</div>
</div>
</body>
</html>